When you pick up the key at the end of a stage, hold Up on the D-pad. Arthur will catch the key and a "Nice Catch" message will appear—a small easter egg with no gameplay effect. Pro Action Replay (PAR) & Game Genie Codes
The SNES version features a multi-purpose hidden menu that combines stage selection with a full sound library.
The primary cheat codes for Super Ghouls 'n Ghosts are entered on the "Configuration" or "Options" screen found on the title screen menu. These do not require a Game Genie; they are built directly into the game’s code by the developers.